Hokatio andeb



H. ANDERSON.

SAFETY VALVE.

No. 74,480- Patented Feb 18, 1868.-

The drawing this patent is not I O R e a an insteinscrawler LettersPatent No. 74,489, dated a ruitry 18, 1868.

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TO ALL WHOM IT'MAY GONCERN:' n Be itlmoiv'n that I, Hoa1rrro Aunnnsom'ofChicago, in the county of 0ook, iu the Statebf Illinois, have inventedan Improved Steam-Generator Safety-Valve; 'and I ,do hereby declare thatthe following is 14; full and exact-description thereof, reference beingbad to' the accompanying drawings, and to the letters of referencemarked thereon, making apart of (his specification, in which- Figure 1is" a vertical sectional elevation of my invention. v a Figure 2, anelevation of thesame, with the upper case removed, together with thevalve-seat. Figure 3, a horizontal section taken through fig. 1 at theline A B. t Figured, a horizontal section taken through the line 0, samefigure.

. Eigure' 5, a plan view of the'invention with the leverdetached.

, Figure 6, a plan view of the valve removed from the seat.

r The nature of my invention consists in the arrangement of a two-partcase for enclos-ing the working partsof the valve, and having a seriesof holes in its top for the escape of steam andth e attachment of aplate, with slots near its periphery, to said case and below theaforesaid holes, for the purpose of preventing thevalve from beingreached from the top and extra pressure oi steam put thereon; also, in aseries of holes throughfthe bottomof the case for preventing the valvefrom being tampered with from-the inside of the boiler; and, further,-

in a-stop attached to the inside of the case, and used to prevent thelever from being" set-on the spindle and thus secure an over-pressure onthe valve and in making the spindle to pass through the valve,and theapplic ation of nuts on it for the purpose of holding the same'inposition after it has been adjusted to recei e a required pressure-ofsteam, a slotted pivot-top being screwed on the top of the spindle, andused in connection with a, lever for testing the valve when pressure isnot at a maximum, and for regulating the tension of a oa'psular springwithout removing the lower part of the case from the boiler. In order togiven. correct understanding of my invention, I letters, and will nowgive a detailed description. r V

Valve R, seat e, flange Z, stand T, spring S, spindle P, an d jamb-nutsc c, are descr led in a patent issued to Horatio Anderson, October 16,1866, and are therefore not claimed in this specifics x. I U, figs. and2, t

have marked corresponding parts with similar represents the lower partof a metal 'caseywhich encloses those parts of the invention a d to, and projecting k i i inside of the boiler, and has a series of holes, X,through its bottom, suflicient for tl sssage of "steam tothe valve, butnot large enough for the jamb-nuts c c to betnrned from the insideofithe a ler. It also supports a flange, 1), arranged to be attached to theboiler in the usual manner, and a flange, w, -r securing itto flange z,fig. 1. The upper part H of the case is made of metal, and with flangesrt, ain't-securing it to the flange z, and with holes 0 o, &c., atthetop for the escape of steam; and has attached to the inside of its domeL a plate, M, having projecting arms, a, between which are openings 72for steam to escape. It will be seen at fig. 1 that' the plate M has agreater diameter than the inside of the raised flange K, by which meansa device,

put through the holes 0,- cannot reach the working parts of the valve R.The spindle P has a screw-thread turned through the valve R. as a not,and the upper end is screwed in a pivot-top, F E, whichytogether withnuts Gr J, is used both'to regulate the tensionof the spring Sand holdthe spindle P in position when a adjusted. B B, fig. 2, represent lugsrigidly attached to the part H of theicase, and'used to support a bolt,A, a H and lever, t. This bolt is arranged with asuitable hole, D, forreceiving an inspector's loch,and the lever t to pass through thepivot-top F E and test the working condition of the valve B, a stop,f,being rigidly attached to the inside of the case, to-prcvcnt the leverfrom being set on the'spindle-P, and thus secure an over prc'ssure ofsteam.

Operation.

When the spring S is to have a greater tension, that part of the case Hshould be removed from the flange a (after the bolts avand A have beenloosened) and the nut J sl'acltened and the spindle I? turned out of,valvej R by means of a wrench put on nut Ga Whena proper tension issecur.d',-'the nut-J should be tightened andthe nut G slackencd, so asto turn pivot-top E F down toits first positionrelative to stop f. V Q aHaving describedtheconstructionandoperation of my invention, I claim- 1.The case U H, arran ed {with holes 0 .11, luge B B,

a dome L, flange K, and stop f, substantially as and for. the purposeheieili described. I Q

- 2. The heles o, in qombinatibn-with the plate M, snbstantiallyhs andfor the purpose setsxorth.

3. The conibib atipe efle ez" t, piv 0 tto p E F,;a.n d stopf,substantially-as s'et fox- Ch.- 4. The combinatien of the pets G J', spi'n@le 1, valyeR; and springs, as :ind for the purpose set forth.

HORATIO ANDERSON. Witnesses:

G. L. GHAPIN,

A. HAYWARD,

